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与硝酸盐一样,可溶性硅酸盐亦为本调查中计划外选测项目,共作了3航次(1981年6,9和10月)的大面观测及3站次的周日连续观测(其中128站两次,分别在1981年6月25—26日和10月22—23日观测;146站一次,在1981年9月25—26日观测)。从测得的结果看,本调查区可溶性硅酸盐含量的变化范围和日较差值都很大,分别在0.30—212μmol SiO_3~2-Si/L(以下用μmol/L表示)和3.7-92.9μmol/L之间,并随海区及观测时间而有很大变化。平面上,硅酸盐含量大致呈Ⅲ区高((?)=58.8μmol/L),Ⅰ区低((?)=23.3μmol/L),Ⅱ区居中((?)=42.9μmol/L)的分布状态。Ⅲ区SiO_3~2-Si含量呈由西南向东北递减的分布趋势,与盐度、碱度的分布趋势相反,与硝酸盐的相似。在01和02断面上硅酸盐浓度的等值线少,大致均匀分布。在03和04断面上等值线密
Like nitrate, soluble silicate was also the unplanned option in this survey. A total of 3 ocean voyages (June, September and October 1981) and 3 consecutive observatories of Sunday (of which 128 stations twice, observed on 25-26 June and 22-23 June 1981 respectively; once on 146 stations and on 25-26 September 1981). From the measured results, the range and diurnal difference of soluble silicate content in this survey area are very large, respectively, ranging from 0.30-212μmol SiO 3-2-Si / L (expressed as μmol / L) and 3.7- 92.9μmol / L, with the sea area and the observation time has changed a lot. In the plane, the content of silicate was approximately (Ⅲ) = 58.8μmol / L in zone Ⅰ, 23.3μmol / L in zone Ⅰ and 42.9μmol / L in zone Ⅱ) The distribution of the state. The content of SiO_3 ~ 2-Si in Ⅲ area shows a decreasing trend from southwest to northeast, which is opposite to the distribution of salinity and alkalinity, similar to that of nitrate. Silicate concentrations on the 01 and 02 profiles are less uniform and roughly uniform. On the 03 and 04 cross-section contour line density